This paper is an attempt to examine some of the microeconomic foundations of this last view of the link between current accounts and exchange rata. Several authors, especially Kouri and de Macedo (1978), but also more recently Dornbusch (1980), have sought to justify the portfolio approach in terms of finance theory, deriving asset demands from a mean-variance framework and arguing that differences in the portfolios of different countries explain why changes in the world distribution of wealth affect exchange rates. What I will do in this paper is to argue that, even under seemingly favorable assumptions, these distribution effects nay run the wrong way; that if they run the right way, they will be very weak; and that the incentives for inter-national, portfolio diversification are in any case small, and can be swamped by quite modest transaction costs or other costs to diversification.

Support

The research activities of the NBER are funded by grants from federal research agencies, by private foundations, and by generous donations from our corporate associates and from private individuals. The NBER is a non-profit, 501(c)(3) organization. For information on supporting the NBER, please contact: